package com.itheima.interceptors;

import com.itheima.pojo.Result;
import com.itheima.utils.JwtUtil;
import com.itheima.utils.ThreadLocalUtil;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.val;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.core.ValueOperations;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;

import java.util.Map;

@Component//注入ioc容器
public class LoginInterceptor implements HandlerInterceptor {//拦截器类

    @Autowired
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //获取请求头中的令牌
        String token = request.getHeader("Authorization");
        //验证token
        try {
            //从redis中获得相同的token
            ValueOperations<String,String> valueOperations = stringRedisTemplate.opsForValue();
            String redistoken = valueOperations.get(token);
            if (redistoken == null){
                throw new RuntimeException("token已失效，请重新登录");
            }
            Map<String , Object> claims = JwtUtil.parseToken(token);

            ThreadLocalUtil.set(claims);

            return true;
        } catch (Exception e) {
            //http相应状态码为401
            response.setStatus(401);
            return false;//不放行
        }
    }
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        //清理ThreadLocal中的数据
        ThreadLocalUtil.remove();
    }
}
